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Block Isoperimetric problems

Block Isoperimetric problems. What do math and Legos ™ have in common? Whales. Our Research Problem. Using Legos ™, what is the smallest perimeter that will enclose a given area?. Our Research Problem Background Information Whale Theorem Proof Hydropronic Sequence Future Work.

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Block Isoperimetric problems

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  1. Block Isoperimetric problems What do math and Legos™ have in common? Whales.

  2. Our Research Problem Using Legos™,what is the smallest perimeter that will enclose a given area?

  3. Our Research Problem Background Information Whale Theorem Proof Hydropronic Sequence Future Work Historical motivation

  4. Queen Dido

  5. Previous Work • Maximum area is always square or pronic. • Perimeter is always even. • Conclusion: A square or a square-like rectangle has the greatest amount of area.

  6. Relations Between The Projects • They maximized area given a specified perimeter. We wanted to minimize perimeter given a specified area. • Research Question: Given a specified area, what is the most efficient way to enclose that given area?

  7. Definitions! • Lego™ Curve: a single continuous arrangement of 1x1 blocks such that each block has exactly two neighbors. * • Neighbor: a block that occupies the space adjacent to another block in one of the four cardinal directions along the grid. * • * Referenced from work of: Bower, Espinoza, Green, Roca, and Townsend

  8. Improper LegoTM Curves

  9. Definitions! • Perimeter: the number of blocks used to create a Lego™ curve. (Reminder: Perimeters are always even) • Area: the number of studs enclosed by a Lego™ curve.

  10. Our Research Problem Background Information Whale Theorem Proof Hydropronic Sequence Future Work Whale Theorem

  11. The Whale Theorem Using Legos™, what is the smallest perimeter needed to enclose a specified area?

  12. Our Research Problem Background Information Whale Theorem Proof Hydropronic Sequence Future Work Proof

  13. Arrangement of Blocks Area: 45 Next Square or Pronic: 49

  14. Arrangement of Blocks Area: 45 Next Square or Pronic: 49

  15. Arrangement of Blocks Area: 45 Next Square or Pronic: 49

  16. Arrangement of Blocks Area: 45 Next Square or Pronic: 49

  17. Arrangement of Blocks Area: 45 Next Square or Pronic: 49

  18. Arrangement of Blocks Area: 45 Next Square or Pronic: 49

  19. Arrangement of Blocks Area: 45 Next Square or Pronic: 49

  20. Arrangement of Blocks Area: 45 Next Square or Pronic: 49

  21. Non Square & Non Pronic Formula • In order to find the next possible square or pronic use this formula: • Examples: • A = 8 • A = 2012

  22. Examples • A = 8 • A = 2012

  23. Graph of: Next Square or Pronic Desired Area to Enclose

  24. Graph of: Area Perimeter

  25. Our Research Problem Background Information Whale Theorem Proof Hydropronic Numbers Future Work HYDRoPRONIC Numbers

  26. Hydropronic Numbers • A number that is not square or pronic and can be arranged as a rectangle using its two closest factors to maintain minimum perimeter. • 3, 8, 10, 15, 18, 21, 24, 28, 32, 35, 40, 45…etc

  27. Hydropronic Numbers • Example: A = 24 • Factors: 1, 2, 3, 4, 6, 8, 12, 24 • Arrange a rectangle of 6 x 4

  28. Hydropronic Area: 24 Hydropronic: 6 x 4 (24)

  29. Whale Theorem Area: 24 Next Square or Pronic: 5 x 5 (25)

  30. Optimal Perimeters for Area = 24

  31. Finding Hydropronic Numbers

  32. WhaLego Sequence • Numbers that can be arranged as rectangles and maintain the minimum perimeter are in the WhaLego sequence. All of these numbers can be classified as square, pronic, or hydropronic. • The first few numbers in this sequence are: 1, 2, 3, 4, 6, 8, 9, 10, 12, 15, 16, 18, 20, 21…etc

  33. Our Research Problem Background Information Whale Theorem Proof Hydropronic Numbers Future Work Future work & References

  34. Future Work • Furthering Hydropronic Sequence • Finding a generating formula • Lego Double Bubble Problem • Enclosing two areas • WhaLego sequence shows up • 3-Dimensional Spaces

  35. References • Brower, T.; Espinoza, J.; Green, A.; Roca, A.; Townsend, B. LEGOTM Isoperimetric Problem, preprint (2010). • Capogna, L.; Donatella, D.; Pauls, S.; Tyson, J. An Introduction to the Heisenberg Group and the Sub-Riemannian Isoperimetric Problem, 1st ed., BirkhauserVerlag AG, Basel, Boston, 2007.

  36. Questions? Special thanks to the National Science Foundation (DMS- 1005046), Dr. Casey Douglas, and the St. Mary’s College of Maryland Department of Mathematics and Computer Science.

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